arch/mips/pci/ops-gt64111.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1995, 1996, 1997, 2002 by Ralf Baechle
   7  * Copyright (C) 2001, 2002, 2003 by Liam Davies (ldavies@agile.tv)
   8  */
   9 #include <linux/types.h>
  10 #include <linux/pci.h>
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13
  14 #include <asm/pci.h>
  15 #include <asm/io.h>
  16 #include <asm/gt64120.h>
  17
  18 #include <asm/cobalt/cobalt.h>
  19
  20 /*
  21  * Accessing device 31 hangs the GT64120.  Not sure if this will also hang
  22  * the GT64111, let's be paranoid for now.
  23  */
  24 static inline int pci_range_ck(struct pci_bus *bus, unsigned int devfn)
  25 {
  26         if (bus->number == 0 && devfn == PCI_DEVFN(31, 0))
  27                 return -1;
  28
  29         return 0;
  30 }
  31
  32 static int gt64111_pci_read_config(struct pci_bus *bus, unsigned int devfn,
  33         int where, int size, u32 * val)
  34 {
  35         if (pci_range_ck(bus, devfn))
  36                 return PCIBIOS_DEVICE_NOT_FOUND;
  37
  38         switch (size) {
  39         case 4:
  40                 PCI_CFG_SET(devfn, where);
  41                 *val = GALILEO_INL(GT_PCI0_CFGDATA_OFS);
  42                 return PCIBIOS_SUCCESSFUL;
  43
  44         case 2:
  45                 PCI_CFG_SET(devfn, (where & ~0x3));
  46                 *val = GALILEO_INL(GT_PCI0_CFGDATA_OFS)
  47                     >> ((where & 3) * 8);
  48                 return PCIBIOS_SUCCESSFUL;
  49
  50         case 1:
  51                 PCI_CFG_SET(devfn, (where & ~0x3));
  52                 *val = GALILEO_INL(GT_PCI0_CFGDATA_OFS)
  53                     >> ((where & 3) * 8);
  54                 return PCIBIOS_SUCCESSFUL;
  55         }
  56
  57         return PCIBIOS_BAD_REGISTER_NUMBER;
  58 }
  59
  60 static int gt64111_pci_write_config(struct pci_bus *bus, unsigned int devfn,
  61         int where, int size, u32 val)
  62 {
  63         u32 tmp;
  64
  65         if (pci_range_ck(bus, devfn))
  66                 return PCIBIOS_DEVICE_NOT_FOUND;
  67
  68         switch (size) {
  69         case 4:
  70                 PCI_CFG_SET(devfn, where);
  71                 GALILEO_OUTL(val, GT_PCI0_CFGDATA_OFS);
  72
  73                 return PCIBIOS_SUCCESSFUL;
  74
  75         case 2:
  76                 PCI_CFG_SET(devfn, (where & ~0x3));
  77                 tmp = GALILEO_INL(GT_PCI0_CFGDATA_OFS);
  78                 tmp &= ~(0xffff << ((where & 0x3) * 8));
  79                 tmp |= (val << ((where & 0x3) * 8));
  80                 GALILEO_OUTL(tmp, GT_PCI0_CFGDATA_OFS);
  81
  82                 return PCIBIOS_SUCCESSFUL;
  83
  84         case 1:
  85                 PCI_CFG_SET(devfn, (where & ~0x3));
  86                 tmp = GALILEO_INL(GT_PCI0_CFGDATA_OFS);
  87                 tmp &= ~(0xff << ((where & 0x3) * 8));
  88                 tmp |= (val << ((where & 0x3) * 8));
  89                 GALILEO_OUTL(tmp, GT_PCI0_CFGDATA_OFS);
  90
  91                 return PCIBIOS_SUCCESSFUL;
  92         }
  93
  94         return PCIBIOS_BAD_REGISTER_NUMBER;
  95 }
  96
  97 struct pci_ops gt64111_pci_ops = {
  98         .read = gt64111_pci_read_config,
  99         .write = gt64111_pci_write_config,
 100 };